De Leon, L. P. (1973). The effect of grouping on achievement, classroom participation and interaction of students in modern geometry at the Manuel L. Quezon (Public) High School, Manila. s.n.].
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)De Leon, Lorenzo Padua. The Effect of Grouping on Achievement, Classroom Participation and Interaction of Students in Modern Geometry at the Manuel L. Quezon (Public) High School, Manila. [Quezon City: s.n.], 1973.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)De Leon, Lorenzo Padua. The Effect of Grouping on Achievement, Classroom Participation and Interaction of Students in Modern Geometry at the Manuel L. Quezon (Public) High School, Manila. s.n.], 1973.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.